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/// # Manual
///
/// tmux ^3.2:
/// ```text:
/// show-environment [-hgs] [-t target-session] [variable]
/// (alias: showenv)
/// ```
///
/// tmux ^2.1:
/// ```text
/// show-environment [-gs] [-t target-session] [variable]
/// (alias: showenv)
/// ```
///
/// tmux ^1.7:
/// ```text
/// show-environment [-g] [-t target-session] [variable]
/// (alias: showenv)
/// ```
///
/// tmux ^1.0:
/// ```text
/// show-environment [-g] [-t target-session]
/// (alias: showenv)
/// ```
#[macro_export]
macro_rules! show_environment {
    // `[-h]`
    (@cmd ($cmd:expr) -h, $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({
            $cmd.hidden()
        }) $($tail)*)
    }};
    // `[-g]`
    (@cmd ($cmd:expr) -g, $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({
            $cmd.global()
        }) $($tail)*)
    }};
    // `[-s]`
    (@cmd ($cmd:expr) -s, $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({
            $cmd.as_shell_commands()
        }) $($tail)*)
    }};
    // `[-t target-session]` - target-session
    (@cmd ($cmd:expr) -t $target_session:expr, $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({
            $cmd.target_session($target_session)
        }) $($tail)*)
    }};
    // `[variable]`
    (@cmd ($cmd:expr) $variable:expr, $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({
            $cmd.variable($variable)
        }) $($tail)*)
    }};
    //(@cmd ($cmd:expr) -$unknown:tt, $($tail:tt)*) => {{
        //::std::compile_error!("unknown flag, option or parameter");
    //}};
    (@cmd ($cmd:expr)) => {{
        $cmd
    }};
    () => {{
        $crate::ShowEnvironment::new()
    }};
    (($cmd:expr), $($tail:tt)*) => {{
        $crate::show_environment!(@cmd ($cmd) $($tail)*,)
    }};
    ($($tail:tt)*) => {{
        $crate::show_environment!(@cmd ({ $crate::ShowEnvironment::new() }) $($tail)*,)
    }};

}

#[test]
fn show_environment() {
    use crate::TargetSession;
    use std::borrow::Cow;

    // # Manual
    //
    // tmux ^3.2:
    // ```text:
    // show-environment [-hgs] [-t target-session] [variable]
    // (alias: showenv)
    // ```
    //
    // tmux ^2.1:
    // ```text
    // show-environment [-gs] [-t target-session] [variable]
    // (alias: showenv)
    // ```
    //
    // tmux ^1.7:
    // ```text
    // show-environment [-g] [-t target-session] [variable]
    // (alias: showenv)
    // ```
    //
    // tmux ^1.0:
    // ```text
    // show-environment [-g] [-t target-session]
    // (alias: showenv)
    // ```
    let target_session = TargetSession::Raw("1").to_string();

    let show_environment = show_environment!();
    #[cfg(feature = "tmux_3_2")]
    let show_environment = show_environment!((show_environment), -h);
    #[cfg(feature = "tmux_1_0")]
    let show_environment = show_environment!((show_environment), -g);
    #[cfg(feature = "tmux_2_1")]
    let show_environment = show_environment!((show_environment), -s);
    #[cfg(feature = "tmux_1_7")]
    let show_environment = show_environment!((show_environment), -t & target_session);
    #[cfg(feature = "tmux_1_7")]
    let show_environment = show_environment!((show_environment), "2");

    #[cfg(not(feature = "cmd_alias"))]
    let cmd = "show-environment";
    #[cfg(feature = "cmd_alias")]
    let cmd = "showenv";

    let mut s = Vec::new();
    s.push(cmd);
    #[cfg(feature = "tmux_3_2")]
    s.push("-h");
    #[cfg(feature = "tmux_1_0")]
    s.push("-g");
    #[cfg(feature = "tmux_2_1")]
    s.push("-s");
    #[cfg(feature = "tmux_1_7")]
    s.extend_from_slice(&["-t", "1"]);
    #[cfg(feature = "tmux_1_7")]
    s.push("2");
    let s: Vec<Cow<str>> = s.into_iter().map(|a| a.into()).collect();

    let show_environment = show_environment.build().to_vec();

    assert_eq!(show_environment, s);
}